Subminiature SMT Fuses for 125Vac/250Vac InputsJanuary 04, 2015 by Jeff Shepard
Littelfuse, Inc. has introduced two new series of its popular NANO2® Subminiature Fuse, each of which provides surge tolerance and circuit protection against overload conditions for downstream components. Both feature highly compact surface mountable packages for high design flexibility in space-constrained applications; the SMT design supports higher placement speed and higher yields during product manufacturing. With a 1206 (3.15x1.5mm) footprint, the 470 Series Fuse is the smallest 125Vac-rated surface-mountable fuse available in the Littelfuse portfolio; it is designed mainly to serve as primary-side circuit protection in compact applications with high ac voltage requirements. It has outstanding performance characteristics, including high breaking capacity and unparalleled I2t values.
The 476 Series is a family of 250Vac-rated surface mountable fuses in a compact 2410 (6.10mm x 2.69mm) footprint. It is the smallest SMT fuse with this high voltage rating and, like the 470 Series, is designed for primary-side circuit protection in compact devices with high voltage requirements. The 476 Series operates at extreme temperatures without excessive sacrifices on current re-rating. It is available in the highest number of amperage ratings at the rated voltages, up to 5A rated to 250V, compared to only up to the 2A rating currently available in the market. Typical applications for the 470 and 476 Series include LED lighting, LCD/LED TVs, white goods (major household appliances), notebooks/PCs and power supply units.
â€œThe 470 Series meets the US ENERGY STARÂ® surge immunity requirements (1.5A and above ampere rating only) and has an operating temperature of 125 degrees C, so itâ€™s suited for LED lighting applications. When installed, it withstands surges from the ac power input line and keeps lighting working continuously,â€ said Daniel Wang, product manager for the 470 and 476 Series product lines. â€œThe 476 Series meets the global IEC61000-4-5 2 ed. Surge Immunity test requirements (3A and above ampere rating only) for ratings applicable to most LED lighting applications, and is available with complete/combined interrupting ratings for most high voltage applications.â€
The 470 Series NANO2Â® Subminiature Fuse is available in quantities of 1,500 and the 476 Series NANO2Â® Subminiature Fuse is available in quantities of 1,000, both in tape and reel packaging. Sample requests can be placed through authorized Littelfuse distributors worldwide.